Preheat oven to 350 degrees.
Line a 7X11 inch baking pan with aluminum foil and spray with cooking spray.
In a stand mixer or with an electric mixer combine Nutella, eggs and flour until all the flour is absorbed.
Pour the batter into the prepared pan and spread evenly. Bake for 25-30 minutes.
Cool the brownies completely and pull them out of the pan. Use the foil to lift them out.
Cut the brownies in half lengthwise. With a very sharp knife start making diagonal cuts on each long piece to cut out triangles.
Decorate with colored frosting and sprinkles. I used green and rainbow nonpareils but you can use whatever you like.
Insert the candy cane sticks at the base and serve!